Plex Out of Sync

[jrkl75]

Heya.

When you start a video in PLEX (local server http://127.0.0.1:32400/) and switch tab, the video and audio will run out of sync over time.

I can't remember exactly when this occurred, but I think it started when some of the the changes regarding the memory-save-tab-thing-something-like-that was introduced.

I didn't think too much of it in the beginning, but it's becoming an annoyance.

Now, I wouldn't blame this on Vivaldi immediately, so I downloaded FLOORP. Logged in and did the same things as I do in Vivaldi. No matter what I do, no matter how long I am doing other things in other tabs, the video does not run out of sync in FLOORP.

Anyone else with this issue or anyone with ideas where I can look under the hood?

Thanks in advance.

ps: I completely forgot how ugly and non-intuitive the gecko based browsers are (compared to vivaldi).

[DoctorG]

@jrkl75 Check without any extensions Try Guest Profile and tell if that works.

Please try the troubleshooting steps, including testing in a clean profile and disabling adblocking/extensions:
https://help.vivaldi.com/desktop/troubleshoot/troubleshooting-issues/

Which Vivaldi and Windows (see Vivaldi menu → About)?

Which GPU and driver?
Hardware accleleration active?
What shows vivaldi:gpu ?

Perhaps a codecs issue?
Close all tabs
Open vivaldi:media-internals in one tab
Play video in other tab
Save log
Paste log here with </> button as code block
Tell at which time code it gets out of sync!

[jrkl75]

I tried the Guest mode and let it run in the background whilst watching some youtube vids. It did not run out of sync. I will do some more testing and mention my finding(s) here. Thanks for pointing this out.

[DoctorG]

@jrkl75 Guest Mode is a clean new profile, so it is something in your current profile which cause a out-of-sync after a while.

[jrkl75]

Oh, no, I spoke too soon... ...

I removed all the extensions from my main profile and started to test again. Same result. I went back to the Guest Profile and now I had the same issue.

Vivaldi 7.3.3635.12 (Stable channel) (64-bit)
Revision d793a38246ec9848e88f118eece993ee4235d0d7
OS Windows 10 Version 21H2 (Build 19044.1320)
RTX 4070: 566.03
Hardware Acceleration: ON

media-internals:

[
  {
      "properties": {
      "render_id": 230,
      "player_id": 4,
      "created": "2025-05-09 12:58:32.161546 UTC",
      "origin_url": "http://127.0.0.1:32400/",
      "kFrameUrl": "http://127.0.0.1:32400/web/index.html#!/",
      "kFrameTitle": "▶ Test Video Out Of Sync",
      "url": "http://127.0.0.1:32400/library/parts/5716/1738281675/file.mp4?X-Plex-Session-Identifier=7o1u6c1lijjnng69lb3d68fa&X-Plex-Product=Plex%20Web&X-Plex-Version=4.145.1&X-Plex-Client-Identifier=x8f6a3n5hudwfw9nausk5sqo&X-Plex-Platform=Chrome&X-Plex-Platform-Version=134.0&X-Plex-Features=external-media%2Cindirect-media%2Chub-style-list&X-Plex-Model=bundled&X-Plex-Device=Windows&X-Plex-Device-Name=Chrome&X-Plex-Device-Screen-Resolution=2208x1315%2C2560x1440&X-Plex-Token=eZUqaeVJA8WVGGAdd7rW&X-Plex-Language=en&Accept-Language=en&X-Plex-Session-Id=f53861b6-5b99-4895-80aa-617b09363af5&X-Plex-Playback-Session-Id=cda62fdf-9945-42b5-86a4-4f656bee1773&X-Plex-Playback-Id=4231ca9b-9a0a-4c08-8b0f-632b2d481488",
      "kTotalBytes": "0xe68e5912",
      "kIsStreaming": false,
      "kIsSingleOrigin": true,
      "kIsRangeHeaderSupported": true,
      "kRendererName": "RendererImpl",
      "pipeline_state": "kPlaying",
      "info": "D3D11VideoDecoder is using array texture",
      "kAudioTracks": [
        {
          "bytes per channel": 2,
          "bytes per frame": 4,
          "channel layout": "STEREO",
          "channels": 2,
          "codec": "aac",
          "codec delay": 0,
          "discard decoder delay": true,
          "encryption scheme": "Unencrypted",
          "has extra data": true,
          "profile": "unknown",
          "sample format": "Signed 16-bit",
          "samples per second": 44100,
          "seek preroll": "0us"
        }
      ],
      "kVideoTracks": [
        {
          "alpha mode": "is_opaque",
          "codec": "h264",
          "coded size": "1920x1080",
          "color space": {
            "matrix": "BT709",
            "primaries": "BT709",
            "range": "LIMITED",
            "transfer": "BT709"
          },
          "encryption scheme": "Unencrypted",
          "has extra data": true,
          "hdr metadata": "unset",
          "natural size": "1920x1080",
          "orientation": "0°",
          "profile": "h264 high",
          "visible rect": "0,0 1920x1080"
        }
      ],
      "kMaxDuration": 10343.352018,
      "kStartTime": 0,
      "kBitrate": 2991748,
      "kIsAudioDecryptingDemuxerStream": false,
      "kAudioDecoderName": "FFmpegAudioDecoder",
      "kIsPlatformAudioDecoder": false,
      "kIsVideoDecryptingDemuxerStream": false,
      "kVideoDecoderName": "D3D11VideoDecoder",
      "kIsPlatformVideoDecoder": true,
      "dimensions": "1920x1080",
      "kResolution": "1920x1080",
      "seek_target": 1426,
      "duration": 10343.352018,
      "pipeline_buffering_state": {
        "for_suspended_start": false,
        "state": "BUFFERING_HAVE_ENOUGH"
      },
      "event": "kPlay",
      "video_track_selected": "1",
      "warning": " Large timestamp gap detected; may cause AV sync to drift. time:1496409977us expected:1494366621us delta:2043356us"
    },
    "events": [
      {
        "time": 0,
        "key": "created",
        "value": "2025-05-09 12:58:32.161546 UTC"
      },
      {
        "time": 0.10800000093877316,
        "key": "origin_url",
        "value": "http://127.0.0.1:32400/"
      },
      {
        "time": 0.1119999997317791,
        "key": "kFrameUrl",
        "value": "http://127.0.0.1:32400/web/index.html#!/"
      },
      {
        "time": 0.11500000022351742,
        "key": "kFrameTitle",
        "value": "▶ Mark Wiens - Eating Indian Street Food for 7 Days"
      },
      {
        "time": 0.18400000035762787,
        "key": "url",
        "value": "http://127.0.0.1:32400/library/parts/5716/1738281675/file.mp4?X-Plex-Session-Identifier=7o1u6c1lijjnng69lb3d68fa&X-Plex-Product=Plex%20Web&X-Plex-Version=4.145.1&X-Plex-Client-Identifier=x8f6a3n5hudwfw9nausk5sqo&X-Plex-Platform=Chrome&X-Plex-Platform-Version=134.0&X-Plex-Features=external-media%2Cindirect-media%2Chub-style-list&X-Plex-Model=bundled&X-Plex-Device=Windows&X-Plex-Device-Name=Chrome&X-Plex-Device-Screen-Resolution=2208x1315%2C2560x1440&X-Plex-Token=eZUqaeVJA8WVGGAdd7rW&X-Plex-Language=en&Accept-Language=en&X-Plex-Session-Id=f53861b6-5b99-4895-80aa-617b09363af5&X-Plex-Playback-Session-Id=cda62fdf-9945-42b5-86a4-4f656bee1773&X-Plex-Playback-Id=4231ca9b-9a0a-4c08-8b0f-632b2d481488"
      },
      {
        "time": 5.276000000536442,
        "key": "kTotalBytes",
        "value": "0xe68e5912"
      },
      {
        "time": 5.283999999985099,
        "key": "kIsStreaming",
        "value": false
      },
      {
        "time": 5.283999999985099,
        "key": "kIsSingleOrigin",
        "value": true
      },
      {
        "time": 5.285000000149012,
        "key": "kIsRangeHeaderSupported",
        "value": true
      },
      {
        "time": 5.384999999776483,
        "key": "kRendererName",
        "value": "RendererImpl"
      },
      {
        "time": 5.40400000102818,
        "key": "pipeline_state",
        "value": "kStarting"
      },
      {
        "time": 86.07200000062585,
        "key": "info",
        "value": "FFmpegDemuxer: created video stream, config codec: h264, profile: h264 high, level: not available, alpha_mode: is_opaque, coded size: [1920,1080], visible rect: [0,0,1920,1080], natural size: [1920,1080], has extra data: true, encryption scheme: Unencrypted, rotation: 0°, flipped: 0, color space: {primaries:BT709, transfer:BT709, matrix:BT709, range:LIMITED}"
      },
      {
        "time": 86.09899999946356,
        "key": "info",
        "value": "FFmpegDemuxer: created audio stream, config codec: aac, profile: unknown, bytes_per_channel: 2, channel_layout: STEREO, channels: 2, samples_per_second: 44100, sample_format: Signed 16-bit, bytes_per_frame: 4, seek_preroll: 0us, codec_delay: 0, has extra data: true, encryption scheme: Unencrypted, discard decoder delay: true, target_output_channel_layout: NONE, target_output_sample_format: Unknown sample format, has aac extra data: true"
      },
      {
        "time": 86.10800000093877,
        "key": "kAudioTracks",
        "value": [
          {
            "bytes per channel": 2,
            "bytes per frame": 4,
            "channel layout": "STEREO",
            "channels": 2,
            "codec": "aac",
            "codec delay": 0,
            "discard decoder delay": true,
            "encryption scheme": "Unencrypted",
            "has extra data": true,
            "profile": "unknown",
            "sample format": "Signed 16-bit",
            "samples per second": 44100,
            "seek preroll": "0us"
          }
        ]
      },
      {
        "time": 86.11700000055134,
        "key": "kVideoTracks",
        "value": [
          {
            "alpha mode": "is_opaque",
            "codec": "h264",
            "coded size": "1920x1080",
            "color space": {
              "matrix": "BT709",
              "primaries": "BT709",
              "range": "LIMITED",
              "transfer": "BT709"
            },
            "encryption scheme": "Unencrypted",
            "has extra data": true,
            "hdr metadata": "unset",
            "natural size": "1920x1080",
            "orientation": "0°",
            "profile": "h264 high",
            "visible rect": "0,0 1920x1080"
          }
        ]
      },
      {
        "time": 86.125,
        "key": "kMaxDuration",
        "value": 10343.352018
      },
      {
        "time": 86.12600000016391,
        "key": "kStartTime",
        "value": 0
      },
      {
        "time": 86.14599999971688,
        "key": "kBitrate",
        "value": 2991748
      },
      {
        "time": 87.21299999952316,
        "key": "info",
        "value": "Effective playback rate changed from 0 to 1"
      },
      {
        "time": 91.58699999935925,
        "key": "kIsAudioDecryptingDemuxerStream",
        "value": false
      },
      {
        "time": 91.58999999985099,
        "key": "kAudioDecoderName",
        "value": "FFmpegAudioDecoder"
      },
      {
        "time": 91.5910000000149,
        "key": "kIsPlatformAudioDecoder",
        "value": false
      },
      {
        "time": 91.59999999962747,
        "key": "info",
        "value": "Selected FFmpegAudioDecoder for audio decoding, config: codec: aac, profile: unknown, bytes_per_channel: 2, channel_layout: STEREO, channels: 2, samples_per_second: 44100, sample_format: Signed 16-bit, bytes_per_frame: 4, seek_preroll: 0us, codec_delay: 0, has extra data: true, encryption scheme: Unencrypted, discard decoder delay: true, target_output_channel_layout: QUAD, target_output_sample_format: Unknown sample format, has aac extra data: true"
      },
      {
        "time": 91.65400000102818,
        "key": "info",
        "value": "Cannot select DecryptingVideoDecoder for video decoding"
      },
      {
        "time": 94.84200000017881,
        "key": "info",
        "value": "D3D11VideoDecoder is using h264 high / 4:2:0"
      },
      {
        "time": 94.87199999950826,
        "key": "info",
        "value": "D3D11VideoDecoder producing NV12"
      },
      {
        "time": 94.87700000032783,
        "key": "info",
        "value": "D3D11VideoDecoder: Selected NV12"
      },
      {
        "time": 94.88100000098348,
        "key": "info",
        "value": "D3D11VideoDecoder is binding textures"
      },
      {
        "time": 94.88299999944866,
        "key": "info",
        "value": "D3D11VideoDecoder is using D3D11 backend"
      },
      {
        "time": 95.56599999964237,
        "key": "info",
        "value": "D3D11VideoDecoder is using array texture"
      },
      {
        "time": 95.58799999952316,
        "key": "info",
        "value": "Selected D3D11VideoDecoder adapter LUID:{0, 54723}"
      },
      {
        "time": 95.59600000083447,
        "key": "info",
        "value": "Video is supported by D3D11VideoDecoder"
      },
      {
        "time": 95.6359999999404,
        "key": "kIsVideoDecryptingDemuxerStream",
        "value": false
      },
      {
        "time": 95.6820000000298,
        "key": "kVideoDecoderName",
        "value": "D3D11VideoDecoder"
      },
      {
        "time": 95.68300000019372,
        "key": "kIsPlatformVideoDecoder",
        "value": true
      },
      {
        "time": 95.69199999980628,
        "key": "info",
        "value": "Selected D3D11VideoDecoder for video decoding, config: codec: h264, profile: h264 high, level: not available, alpha_mode: is_opaque, coded size: [1920,1080], visible rect: [0,0,1920,1080], natural size: [1920,1080], has extra data: true, encryption scheme: Unencrypted, rotation: 0°, flipped: 0, color space: {primaries:BT709, transfer:BT709, matrix:BT709, range:LIMITED}"
      },
      {
        "time": 95.71499999985099,
        "key": "pipeline_state",
        "value": "kPlaying"
      },
      {
        "time": 95.96900000050664,
        "key": "info",
        "value": "D3D11VideoDecoder config change: profile: h264 high, chroma_sampling_format: 4:2:0, coded_size: 1920x1088, bit_depth: 8, color_space: {primary=1, transfer=1, matrix=1, range=1}"
      },
      {
        "time": 95.97800000011921,
        "key": "info",
        "value": "D3D11VideoDecoder is using h264 high / 4:2:0"
      },
      {
        "time": 95.99100000038743,
        "key": "info",
        "value": "D3D11VideoDecoder producing NV12"
      },
      {
        "time": 95.99799999967217,
        "key": "info",
        "value": "D3D11VideoDecoder: Selected NV12"
      },
      {
        "time": 96.00100000016391,
        "key": "info",
        "value": "D3D11VideoDecoder is binding textures"
      },
      {
        "time": 96.00600000098348,
        "key": "info",
        "value": "D3D11VideoDecoder is using D3D11 backend"
      },
      {
        "time": 96.43500000052154,
        "key": "info",
        "value": "D3D11VideoDecoder is using array texture"
      },
      {
        "time": 110.18899999931455,
        "key": "dimensions",
        "value": "1920x1080"
      },
      {
        "time": 110.19400000013411,
        "key": "kResolution",
        "value": "1920x1080"
      },
      {
        "time": 113.00600000098348,
        "key": "seek_target",
        "value": 1426
      },
      {
        "time": 113.03299999982119,
        "key": "pipeline_state",
        "value": "kSeeking"
      },
      {
        "time": 116.75100000016391,
        "key": "pipeline_state",
        "value": "kPlaying"
      },
      {
        "time": 86.10400000028312,
        "key": "duration",
        "value": 10343.352018
      },
      {
        "time": 256.1359999999404,
        "key": "pipeline_buffering_state",
        "value": {
          "for_suspended_start": false,
          "state": "BUFFERING_HAVE_ENOUGH"
        }
      },
      {
        "time": 87.29199999943376,
        "key": "event",
        "value": "kPlay"
      },
      {
        "time": 11357.107000000775,
        "key": "video_track_selected",
        "value": "unset"
      },
      {
        "time": 11357.325999999419,
        "key": "pipeline_buffering_state",
        "value": {
          "for_suspended_start": false,
          "state": "BUFFERING_HAVE_ENOUGH"
        }
      },
      {
        "time": 68369.68200000003,
        "key": "video_track_selected",
        "value": "1"
      },
      {
        "time": 68383.20199999958,
        "key": "warning",
        "value": " Large timestamp gap detected; may cause AV sync to drift. time:1496409977us expected:1494366621us delta:2043356us"
      },
      {
        "time": 68395.07100000046,
        "key": "pipeline_buffering_state",
        "value": {
          "for_suspended_start": false,
          "state": "BUFFERING_HAVE_ENOUGH"
        }
	  }
   }
]

The GPU file is too long (too many characters). Any specific region/section you want to see?

[Pathduck]

This was reported by someone earlier:
https://forum.vivaldi.net/topic/107532/audio-desynchronizes-from-videos-if-i-move-to-other-tabs

Seems to happen only on certain players/sites, not on Youtube/Vimeo for instance.
Apparently an upstream Chromium issue:
https://issues.chromium.org/issues/404464587

I recommend you install the latest Snapshot as a Standalone to test and see if the issue occurs there.
https://vivaldi.com/blog/desktop/
Vivaldi 7.4 with Chromium 136 will probably be released within the next week or so.

[jrkl75]

@Pathduck Thanks for the link to the other topic. I'll do a test in in the unstable version.

NOTE: Issue also occurs in linux .deb and flatpak. Tested in Ubuntu 24 (snapd removed), Ubuntu 25 (snapd removed) and EndeavourOS.

[DoctorG]

@jrkl75 And on latest 7.4.3684.18 Snapshot (has a separate profile folder)?

[jrkl75]

@DoctorG said in Plex Out of Sync:

@jrkl75 And on latest 7.4.3684.18 Snapshot (has a separate profile folder)?

Yes, I just downloaded that version and the same video is running in the background and I have a YT video running in the current tab. There is no profile seems like (WORK). There are no extensions, what so ever. I'll let it run for a couple of minutes and report.

[jrkl75]

Can confirm that it works fine in snapshot 7.4.3684.18.
There is 0 delay. Thanks. I'll wait for stable release.

[DoctorG]

@jrkl75 said in Plex Out of Sync:

Can confirm that it works fine in snapshot 7.4.3684.18.

Ah, thanks for test. I will update bug tracker entries.